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LMH1980

www.ti.com

SNLS263A –JULY 2007–REVISED MARCH 2013

LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator

Check for Samples: LMH1980

FEATURES

DESCRIPTION

The LMH1980 is an auto-detecting SD/HD/PC video

• Analog Video Sync Separation for NTSC, PAL,

sync separator ideal for use in a wide range of video

480I/P, 576I/P, 720P, 1080I/P/PsF, and Many

applications, such as automotive LCD monitors, video

VESA-Compatible Timing Formats

capture & editing devices, surveillance & security

• Composite Video (CVBS), S-Video (Y/C), and

equipment, and machine vision and inspection

Component Video (YP

/GBR) and PC

systems.

Graphics (RGsB) Interfaces

The LMH1980 accepts an analog video input signal

• SD/PC Bi-Level Sync & HD Tri-Level Sync

with either bi-level or tri-level sync and automatically

Compatible

detects the video format, eliminating the need for

external R

SET

resistor adjustment required by other

• Composite, Horizontal, and Vertical Sync

sync separators (e.g.: LM1881). The outputs provide

Outputs

timing signals in CMOS logic, including Composite,

• Burst/Back Porch Timing, Odd/Even Field, and

Horizontal, and Vertical Syncs, Burst/Back Porch

HD Detect Flag outputs

Timing, and Odd/Even Field outputs. The HD flag

• Automatic Video Format Detection

output (pin 5) provides a logic low signal only when a

valid HD video input with tri-level sync is detected.

• Fixed-Level Sync Slicing for Video Inputs from

The HD flag can be used to disable an external

0.5 to 2 V

switch-controlled SD chroma filter when HD video is

• 3.3V to 5V Supply Operation

detected, or enable it when SD video is detected. For

non-standard video with bi-level sync and without

APPLICATIONS

vertical serration pulses, a default vertical sync pulse

will be output and no horizontal sync pulses will be

• Consumer, Professional, Automotive &

output during the vertical sync interval.

Industrial Video

The LMH1980 is available in a space-saving 10-lead

• Video Capture, Editing, and Processing

Mini-SO Package (VSSOP) and operates over a

• Genlock Circuits

temperature range of −40°C to +85°C.

• Surveillance & Security Video Systems

• Set-Top Boxes (STB) & Digital Video

Recorders (DVR)

• LCD / Plasma Displays and Video Projectors

• Machine Vision and Inspection Systems

• Video Trigger Oscilloscopes and Waveform

Monitors

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (22 pages)

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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 LMH1980 Auto-Detecting SD/HD/PC Video Sync Separator Check for Samples: LMH1980 FEATURES DESCRIPTION • The LMH1980 is an auto-detecting SD/HD/PC video sync separator ideal for use in a wide range of video applications, such as automotive LCD monitors, video capture & editing devices, surveillance & security equipment, and machine vision and inspection systems.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com Connection Diagram Top View REXT 1 10 OEOUT GND 2 9 BPOUT VCC 3 8 CSOUT VIN 4 7 VSOUT HD 5 6 HSOUT LMH1980 Figure 1. 10-Lead VSSOP Package See Package Number DGS0010A Pin Descriptions Pin No.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings ESD Tolerance (1) (2) (3) Human Body Model 3.5 kV Machine Model Supply Voltage, VCC 350V 0V to 5.5V −0.3V to VCC + 0.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 Electrical Characteristics www.ti.com (1) Unless otherwise specified, all limits are specified for TA = 25°C, VCC = 3.3V, REXT = 10 kΩ 1%, RL = 10 kΩ, CL < 10 pF.Boldface limits apply at the temperature extremes. See Figure 2 for Test Circuit. Parameter ICC Test Conditions Supply Current No input signal Min (2) Typ (3) Max (2) VCC = 3.3V 10.5 12.5 VCC = 5V 12.0 14.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 LMH1980 Test Circuit J1 VCC J2 GND TP8 VCC 1 1 1 OEOUT REXT 10 k: 1% 1 1 U2 R2 TP7 GND C4 10 PF 2 GND C3 0.1 PF 3 BPOUT LMH1980 CSOUT + VCC R9 100: C5 0.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com START OF FIELD 2 3H 3H 3H ½H VIN 263 LINE # 264 265 266 267 268 269 270 271 272 273 CSOUT HSOUT BPOUT TVSOUT = 3H VSOUT OEOUT EVEN FIELD Figure 4.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 HDTV Vertical Interval Timing Diagram (720P, 1080P) START OF FRAME 20H (36H) H | VIN 750 (1125) 1 3 2 4 5 6 7 25 (41) 8... 26 (42) 27 (43) | LINE # CSOUT | HSOUT | BPOUT | TVSOUT = 3H VSOUT | OEOUT LOGIC HIGH FOR PROGRESSIVE VIDEO FORMATS OEOUT Figure 6.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com ½H START OF FIELD 2 5H 15H | VIN LINE # 563 564 565 566 567 568 569 570... 583 584 585 586 | CSOUT | HSOUT | BPOUT TVSOUT = 3H OEOUT FIELD 2 | VSOUT | Figure 8. 1080I Field 2 Vertical Interval SD/EDTV Horizontal Interval Timing Diagram WHITE LEVEL VIDEO INPUT RANGE 0.5 VPP to 2 VPP VIDEO 1 VPP (typ.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 Table 1.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com HDTV Horizontal Interval Timing Diagram WHITE LEVEL VIDEO INPUT RANGE 0.5 VPP to 2 VPP VIDEO 1 VPP (typ.) 50% TRAILING OH EDGE + SYNC VIN LEADING EDGE BLANKING LEVEL 50% - SYNC 50% CSOUT tdCSOUT HSOUT tdHSOUT THSOUT BPOUT tdBPOUT TBPOUT Figure 10. HDTV Horizontal Interval with Tri-level Sync Table 3.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 APPLICATION INFORMATION GENERAL DESCRIPTION The LMH1980 is designed to extract the timing information from various video formats with standard and nonstandard vertical serration and output the syncs and relevant timing signals in CMOS logic. Its advanced features and easy application make it ideal for consumer, professional, and industrial video systems where sync timing needs to be extracted from SD, HD, and PC video signals.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com – Composite NTSC & PAL (or Component 480I & 576I) without vertical serration & equalization pulses (i.e.: from logical OR-ing of H & V signals) Input Termination The video source should be load terminated with a 75Ω resistor to ensure correct video signal amplitude and minimize signal distortion due to reflections.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 Input Coupling Capacitor The input signal should be AC coupled to the VIN (pin 4) of the LMH1980 with a properly chosen coupling capacitor, CIN. The primary consideration in choosing CIN is whether the LMH1980 will interface with video sources using an AC-coupled output stage. If AC-coupled video sources are expected in the end-application , then it’s recommended to choose a small CIN value such as 0.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com LOGIC OUTPUTS In the absence of a video input signal, the LMH1980 outputs are logic high except for the odd/even field, which is undefined and depends on its previous state, and the composite sync output. Horizontal Sync Output HSOUT (pin 6) produces a negative-polarity horizontal sync signal, or HSync, extracted from the input signal.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 For SDTV formats, the back porch pulse's negative-going leading edge is derived from the input's positive-going sync edge with a propagation delay, and the pulse width spans an appropriate duration of the color burst envelope for NTSC/PAL. For EDTV formats, the back porch pulse behaves similar to the SDTV case except with a narrow pulse width.
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LMH1980 SNLS263A – JULY 2007 – REVISED MARCH 2013 www.ti.com PCB LAYOUT CONSIDERATIONS Please refer to the “LMH1980 Evaluation Board Instruction Manual” Application Note (AN-1618 [SNLA096]) for a good PCB layout example, which adheres to the following suggestions for component placement and signal routing. LMH1980 IC Placement The LMH1980 should be placed such that critical signal paths are short and direct to minimize PCB parasitics from degrading the video input and logic output signals.
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LMH1980 www.ti.com SNLS263A – JULY 2007 – REVISED MARCH 2013 REVISION HISTORY Changes from Original (March 2013) to Revision A • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LMH1980MM/NOPB VSSOP DGS 10 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LMH1980MMX/NOPB VSSOP DGS 10 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 21-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMH1980MM/NOPB VSSOP DGS 10 1000 210.0 185.0 35.0 LMH1980MMX/NOPB VSSOP DGS 10 3500 367.0 367.0 35.
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